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The 47 pages that link to Apparent magnitude, each with the reason it gives.

• Cosmic distance ladderRelated: Observed brightness is compared with calibrated luminosity to infer distance.

• Andromeda GalaxyRelated: Its apparent brightness lets astronomers compare observations and estimate Andromeda’s total luminosity.

• Interstellar extinctionRelated: Extinction increases a star’s apparent magnitude by making it look fainter.

• PhotometryRelated: It expresses observed brightness while depending on distance and intervening effects.

• Standard candleRelated: It records the received brightness compared with the candle’s calibrated output.

• Light curveRelated: Light curves often plot apparent magnitude, whose scale runs backward: smaller values are brighter.

• Color–magnitude diagramRelated: It is the observed brightness quantity plotted on one axis.

• Henrietta Swan LeavittRelated: Leavitt measured changing apparent brightness to identify Cepheid periods.

• Variable starRelated: Variable-star light curves track changes in apparent magnitude.

• SiriusRelated: Sirius ranks first among stars in apparent brightness.

• Sloan Digital Sky SurveyRelated: SDSS magnitudes quantify observed brightness in each imaging band.

• Distance modulusRelated: It is the observed-brightness term in the difference defining distance modulus.

• RR Lyrae variableRelated: Comparing apparent brightness with intrinsic luminosity yields an RR Lyrae star’s distance.

• Tully–Fisher relationRelated: Observed brightness is compared with the relation’s predicted intrinsic brightness.

• AsterismRelated: Bright stars make asterisms easier to recognize across the sky.

• Color indexRelated: Color indices subtract magnitudes measured through separate bands.

• Astronomical observationRelated: It provides a standardized way to compare observed celestial brightness.

• Atmospheric extinctionRelated: Extinction makes an object's apparent magnitude numerically larger.

• PleiadesRelated: It quantifies why the Pleiades’ brightest stars are visible without optical aid.

• New moonRelated: The Moon’s tiny visible fraction makes it faint near the new phase.

• Bolometric luminosityRelated: A magnitude in one observing band is not the star's total luminosity.

• Naked-eye astronomyRelated: It describes which stars and planets are bright enough to detect without instruments.

• Messier objectRelated: Observed brightness helps explain which objects Messier could record with his telescopes.

• RigelRelated: Rigel’s apparent brightness combines its great output with its distance.

• AldebaranRelated: Its ranking as Taurus’s brightest star depends on apparent, not intrinsic, brightness.

• DenebRelated: Deneb looks bright despite its great distance because it emits so much light.

• AchernarRelated: Its high apparent brightness makes Achernar conspicuous in the southern sky.

• Messier 13Related: Its apparent magnitude explains why the cluster can be spotted with binoculars under dark skies.

• Abd al-Rahman al-SufiRelated: Al-Sufi refined the recorded brightness estimates for stars in Ptolemy’s catalog.

• Canis MinorRelated: Procyon’s high apparent brightness is why it stands out in this otherwise faint constellation.

• Corona AustralisRelated: The constellation’s stars are mostly faint, so brightness determines which outline is easiest to trace.

• Dumbbell NebulaRelated: Its apparent brightness helps explain why Messier 27 is a popular target for amateur telescopes.

• Beehive ClusterRelated: Its apparent brightness helps explain why the cluster is visible to the unaided eye.

• Beta CentauriRelated: Its apparent brightness explains why Beta Centauri is a prominent naked-eye star.

• CamelopardalisRelated: The modest apparent brightness of its stars helps explain why Camelopardalis is difficult to recognize.

• Epsilon Canis MajorisRelated: Adhara’s apparent brightness explains its prominence in the night sky.

• Gamma CassiopeiaeRelated: Brightness changes in this measure reveal the star’s optical variability.

• Leo MinorRelated: The constellation’s relatively faint stars make brightness useful for judging visibility.

• Messier 7Related: Its brightness helps explain why Messier 7 is visible to the unaided eye.

• Pi PuppisRelated: Its apparent brightness helps explain Pi Puppis’s visibility in the night sky.

• Planets beyond NeptuneRelated: A distant planet’s reflected sunlight may be too faint for existing surveys.

• SN 1972ERelated: Comparing SN 1972E's apparent brightness with its calibrated intrinsic brightness yields distance.

• Uppsala General CatalogueRelated: Brightness thresholds help determine which galaxies photographic surveys record.